Declaring a Function

Part of the Fundamentals section of Coddy's GO journey — lesson 52 of 109.

Let's learn how to declare a function in Go that takes multiple parameters of the same type.

First, let's create a function that adds three integers together:

func addThree(x, y, z int) int {
    return x + y + z
}

func main() {
    sum := addThree(5, 10, 15)
    fmt.Println("The sum is:", sum)
}

After executing this code, the value 30 (which is 5 + 10 + 15) will be calculated and stored in the sum variable. Then the message "The sum is: 30" will show on the screen:

The sum is: 30

Notice that we wrote x, y, z int instead of writing x int, y int, z int. This is a helpful shorthand in Go when multiple parameters share the same type - it makes our code shorter and cleaner.

Challenge

Beginner

In this challenge, you'll practice declaring a function in Go. Your task is to complete the greet function that takes a name as a parameter and returns a greeting message.

The function should return a string in the format: "Hello, [name]!"

Cheat sheet

When multiple parameters share the same type in Go, you can use shorthand syntax:

func addThree(x, y, z int) int {
    return x + y + z
}

This is equivalent to writing x int, y int, z int but more concise.

Try it yourself

package main

import "fmt"

// TODO: Complete the greet function that takes a name parameter
// and returns a greeting string

// func greet() {
//    
// }

func main() {
    // These test cases are already set up for you
    name1 := "Alice"
    name2 := "Bob"
    
    // Testing the greet function
    message1 := greet(name1)
    message2 := greet(name2)
    
    fmt.Println(message1)
    fmt.Println(message2)
}